Air Force Academy Chapel made of 100 identical tetrahedrons works to inspire those of all religions.

This spectacular track has run continuously since 1882.

Strange red rock formations that have been attributed to a higher power for hundreds of years.

The ancient dwellings of the Puebloans, located in the cliffs of majestic mesas.

The last remaining relic of San Francisco's glittering 1915 Panama Pacific Exposition.

San Francisco's newly reopened hands-on science museum.

Carnivorous plants, medieval aphrodisiacs, and the largest original wood structure glass conservatory in the western hemisphere.

Relics of the 1894 Midwinter Exposition continue to delight visitors today.

In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.

This road in the Great Smoky Mountains was supposed to assuage a displaced community, but ended up a $52 million dead end.

A park where people have been going to feed friendly pigeons since the 18th century

This bleach-white graveyard overlooking the ocean is accessed through a tunnel.

The highest point in Tennessee, Clingmans Dome bears witness to the ravages of one type of insect.

Over 20,000 sets of spice shakers reveal the surprisingly telling history of our most basic spices.

An abandoned town is hidden in Great Smoky Mountains National Park.

For two weeks every June, fireflies in the Smoky Mountains perform an astonishing light show.

A mega theme park-wax museum mélange containing all things biblical.

Disney World's very first waterpark is now an abandoned ruin being reclaimed by the swamp.

Once featuring over 60 miniature replicas of famous Chinese locations, the Splendid China theme park was completely abandoned and is now mostly rubble.

A Florida college boasts the world's largest single-site collection of structures designed by Frank Lloyd Wright.

The walls of America's oldest masonry fort famously "swallowed" cannonballs.

One-time winter retreats of prolific inventor Thomas Edison and his friend Henry Ford.

A Circus legend leaves an unexpected endowment.

A monument celebrating the idea of reaching inaccessible places.